<template>
  <div class="channel-edit">
    <van-cell :border="false">
      <div slot="title" class="title-text">我的频道</div>
      <van-button class="edit-btn" type="danger" plain round size="mini" @click="isEdit=!isEdit"


        >{{isEdit ? "完成" : "编辑"}}</van-button
      >
    </van-cell>
    <van-grid class="my-grid" :gutter="10">
      <van-grid-item
        class="grid-item"
        v-for="(channel, index) in myChannels"
        :key="index"
        @click="onMyChannelClick(channel,index)"
      >
        <van-icon slot="icon" name="clear"
        v-show=" isEdit && !fiexdChannels.includes(channel.id)"></van-icon>
        <span class="text" slot="text" :class="{ active: index === active }">{{
          channel.name
        }}</span>
      </van-grid-item>
    </van-grid>

    <!-- 频道推荐 -->
    <van-cell :border="false">
      <div slot="title" class="title-text">频道推荐</div>
    </van-cell>
    <van-grid class="recommend-grid" :gutter="10">
      <van-grid-item
        class="grid-item"
        icon="plus"
        :text="channel.name"
        v-for="(channel, index) in recommentChannels"
        :key="index"
        @click="onAddChannel(channel)"
      />
    </van-grid>
    <!-- /频道推荐 -->
  </div>
</template>

<script>
import { getAllChannels,addUserChannel,deleteUserChannel } from "@/api/channel";
import { mapState } from "vuex";
import { setItem } from "@/utils/storage";
export default {
  name: 'ChannelEdit',
  components: {},
  props: {
      myChannels:{
          type: Array,
          required:true
      },
      active:{
           type: Number,
          required:true
      }
  },
  data () {
    return {
        allChannels:[],
        isEdit:false,
        fiexdChannels: [0],
    }
  },
  computed:{
    ...mapState(["user"]),
    recommentChannels(){
        return this.allChannels.filter(channel=>{
          return !this.myChannels.find(myChannel=>{
                return myChannel.id === channel.id
            })
        })
    },
  },
  watch: {},
  created () {
      this.loadAllChannels()
  },
  mounted () {},
  methods: {
      async loadAllChannels(){
          try {
              const { data }=await getAllChannels()
              this.allChannels=data.data.channels
          } catch (err) {
              console.log(err);
              this.$toast("获取数据失败")
          }
      },
  async onAddChannel(channel){
     this.myChannels.push(channel)

     if (this.user){
       try {
         await addUserChannel({
           id:channel.id,
           seq:this.myChannels.length
         })
       } catch (err) {
         this.$toast("保存失败，请稍后重试")
       }
     }
     else{
       setItem("TOUTIAO_CHANNELS",this.myChannels)
     }
   },
   onMyChannelClick(channel, index) {
     if (this.isEdit) {
       if (this.fiexdChannels.includes(channel.id)) {
         return
       }
        this.myChannels.splice(index,1)
        if (index<=this.active) {
          this.$emit('update-active', this.active-1, true)
        }
        this.deleteUserChannel(channel)
     }
     else {
       this.$emit('update-active', index, false);
     }
   },
   async deleteChannel(channel){
     try {
       if (this.user) {
         await deleteUserChannel(channel.id)
       } else{
         setItem("TOUTIAO_CHANNELS",this.myChannels)
       }
     } catch (err) {
        this.$toast("操作失败，稍后再试")
     }
   }

  },
 
}
</script>

<style scoped lang="less">
.channel-edit {
  padding: 85px 0;
  .title-text {
    font-size: 32px;
    color: #333333;
  }

  .edit-btn {
    width: 104px;
    height: 48px;
    font-size: 26px;
    color: #f85959;
    border: 1px solid #f85959;
  }

  /deep/ .grid-item {
    width: 160px;
    height: 86px;
    .van-grid-item__content {
      white-space: nowrap;
      background-color: #f4f5f6;
      .van-grid-item__text,
      .text {
        font-size: 28px;
        color: #222;
        margin-top: 0;
      }
      .active {
        color: red;
      }
      .van-grid-item__icon-wrapper {
        position: unset;
      }
    }
  }

  /deep/ .my-grid {
    .grid-item {
      .van-icon-clear {
        position: absolute;
        right: -10px;
        top: -10px;
        font-size: 30px;
        color: #cacaca;
        z-index: 2;
      }
    }
  }

  /deep/ .recommend-grid {
    .grid-item {
      .van-grid-item__content {
        flex-direction: row;
        .van-icon-plus {
          font-size: 28px;
          margin-right: 6px;
        }
      }
    }
  }
}
</style>
